Unit 1: Homeostasis/Chemistry of life Review

The cell membrane forms a barrier between the cell and the fluid that surrounds the cell. The cell membrane must not be dissolvable in water, or the cell would fall apart in fluid. What macromolecule forms part of the cell membrane and keeps it from dissolving in water?

• protein

• lipid

• carbohydrate

• nucleic acid

All living things are made of organic compounds which contain the element

• Carbon

• Hydrogen

• Helium

• Oxygen

Which biological molecule contains a large amount of the element nitrogen?

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acid

The maintenance of constant internal conditions in an organism is known as

• homeostasis

• structure specialization

• adaptation

• negative feedback

Fats, oils, and cholesterol are all types of

• hormones

• cell membranes

• fatty acids

• lipids

The four main types of carbon-based molecules in organisms are carbohydrates, lipids, nucleic acids, and

• fatty acids

• starches

• monosaccharides

• proteins

Living things require specific organic molecules in order to survive. The picture above represents some specific examples of foods that are mainly composed of one of these necessary organic molecules. The organic molecules found in these types of food are

• carbohydrates

• lipids

• proteins

• nucleic acids

A macromolecule is composed of smaller units called

• tetramers

• monomers

• polymers

• isomers

· cell membranes

· large biomolecule

· many high energy bonds

· nonpolar covalent bonds

· includes waxes and steroids

· consists mainly of carbon and hydrogen

· more energy per gram than other biomolecules

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The biomolecule described is a...

• carbohydrates

• lipids

• proteins

• nucleic acids

Living cells use ____________ as their main source of energy.

• Protein

• Carbohydrates

• Cellulose

• Nucleic Acids